a:6:{i:0;s:2:"id";i:1;s:11:"create_time";i:2;s:6:"random";i:3;s:6:"mobile";s:3:"_pk";s:2:"id";s:5:"_type";a:4:{s:2:"id";s:16:"int(10) unsigned";s:11:"create_time";s:7:"int(10)";s:6:"random";s:10:"varchar(8)";s:6:"mobile";s:11:"varchar(15)";}}